Type-writing machine.



.A. VV. SMITH. TYPE WRITING MACHINE.

APYLIGATION MLBD Mms, 1913A Patented Nov. s, 1914.

INVENTUR WITNEEEEE:

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unirsi) s'iAajns rairnnrr onirica.

ARTHUR w. SMITH, or New YORK, 1v. Y., Assioivoiz mo asumieron TYiEW-Ri'iuiii. competir, oF ILioN, New Yoitiga `come,oiaa'iion'or NEW mais.

TYPE-WRITING MACHINE.

minata.

Specification of Letters Patent.

Patented Nov. 3, 191.4.

Application filed August 9, 1913. Serial No. 783,924.

nient mechanism which controls the feed of the carriage.

My invention has for its principal object to provide improved escapeinent mechanism i of simple and inexpensive construction, but

thoroughly good and efficient.

My invention also includes improved means whereby the carriage can be withdrawn toward the right without operating the carriage release device.

To the above and other ends, my invention consists in certain features of construction and combinations and arrangements of parts, all of which will be fully set forth herein and particularly pointed out in the claims.

In the 'accompanying drawings, Figure 1 is a partial .frontt0-rear, vertical sectional view of a typewritingV machine having my invention embodied therein. Fi 2 is an enlarged view similar to part of iig. 1 but with the section taken on a different plane. Fig. 3 is an enlarged rear elevation. Fig. el-

is a bottom view of the escapement bracket.

My invention is applicableI or readily adaptable to various forms of typewriting maehines.- l

The machine of which parts are illustrated in the drawing, has a main frame on which is mounted a stationary carriage rail 1 having in its front and rear edges grooves forming raceways for antifriction halls 2, which halls cooperate with the front `and rear rails 3 of a carriage, which carriage also includes end pieces t and various connect'ii'ig devices, such for example, as a rod or shaft. suitably journaled a platen 6 with which cooperate certain paper feed devices, not illus'-y provided with anyi trated. The machine is suitable printing mechanism. I have here shown a printing kej, lever 7 pivoted on a transverse wire 8 and having at its rear end an upright push link 10. Theseare merely `p ivoted at 18 in the 'end l riage. A release key, not shown, is provided whereby the rack 14 vcan be lifted, the'arnis In said end pieces 4 there isA typical of any suitable printing mechanism, the parts shown constituting a portion of a typo action which is fully described and claimed 'in my pending application Serial No. 763,532, filed April El5 ,'1913.` Thekey levers 7 are levers of the first order anda universal bar 11 liesacross the rear arms of said levers, lsaid universal bar being part of a-yoke-fraine, which yokeframe also coin` prises arms 12 pivoted at13 in the stationary framework. The carriage can be provided or connected with any suitable escapement rack.

lt designates a straight escapenient rack har havingteeth 15 on its under side and suitably secured to'a strip of angled metal 16 which at its ends is fastened to arms 17 pieces 4I of the car- 17 turning about their pivots 18. Y Said rack is held down normally by one or nmore springs 20.

`The eseapement mechanism is mostly mounted on a bracket 2l, which bracket is secured to the under side ofthe stationary rail 1 by screws 22. two arms 23 inclined downward and toward the, rear of the machine as :shown in Fig. 1, and connected ,together by a cross bar 'or :part 211. Said bracket also 4comprises 'two .lugs 25, Fig. 2, whose upper surfaces rest against the rail 1 and through which the screws 22 pass. The dog rocker 26 is niade of a" Singh` piece `of sheet metal stamped out `to suitable outline and bent up inthe manner illustratedl Said dog rocker includes vtwo ears 27 bent toward the rear from lthe main plane of the rocker and formed with conical holes by which said dog rocker is pivoted on coned pivot pins or screws 28 threaded through the extremities of the arms 23`^whereby said dog rocker is pivoted to the stationary framework of the machine.

The means for operating the dogrocker comprises an arm 30 bent'loffat 31 into a plane at right angles `to the main plane Voi'. the rocker and again bent at'32 at a suitable inclination downward and toward the rear of the machine. It fwill liey erceived that by this double bend any s uitaflile inclination can be given to this arrniO.' 1, Said/arm at its lower end stands just in rear of then per end of an arm 33 projecting iupward; "om" Said bracket comprises width tol allow said the universal bar ll, on which it is rigidly mounted approximately at vthe middle of said universal bar. rllhe construction is'such that when one of the keys 7 is operated and the universal bar is moved upward, the. upper end of said arm 33 pushes thelower end ot the arm toward the" rear and upward and rocks the dog rocker about its pivots 28. A restoring spring` 34 is connected at one end to the arm'30 which is perforated at 35 for' the purpose,and the other end of said' spring is connected to the rear end of a, plate 36 which is secured by means o screws 37 to, the under side of the cross bar 24 of the bracket 21. Saidvscrews 37 pass through elongated slots 38 inl said plate, so that Asaid plate 36 is adjustable in a front and back direction. Said plate at v the rear part thereof is' formed with an oif-set in which is aslot 40, which slot embraces one edge of the dog rocker 26 and is vof a suitable dog rocker a proper motion about its pivot. acts as a stop to limit the rearward motion of the dog rocker, and the other 'wall of the slot acts as :a1 stop to limit the forward motion of the dog rocker, the two-stops being adjustedl together by moving-the plate toward the front or toward .the rear, after which said plate is secured by tightening the screws 37.

rlhe feed dogs are two in number, one dog 41 being pivoted on a pivot screw 42 screwed into the rear face of the dog rocker 26. This dog has two branches, a horizontal branch to which the reference numeral 41 is directly applied. in Fig. 3 and which branch amount of swinging One wall of this slot liessubstantially parallel with the line of motion of the rack 14, and another branch 43 extending away from said rack and having a second dog 44 pivoted thereto on a pivot 45 situated at a distance from the rack so that said dog 44 entends from the pivot 45 toward the rack and is capable of vibrating about said pivot` in', the direction of travelof said rack. The'ldog 41 has a rack-engaging tooth 46 consisting of an car of the sheet metal of which the dog isacomposed, said ear being bent towlard the front of the machine at right angles-y to the plane of the dog. The dog 44 has agsimilar rackengaging tooth 47 but this later is bent out of the plane of the dog towargd the rear of the machine. The dog 44 has an arm 48 to which is connected one end of a spring 50, the other end of which is connected to a pin 51 projecting from the rear face of the dog rocker 26. The direction of pull ofN this spring is such as to tend to roclrathe dog 44 about its pivot and to move the tooth 47 oi said doe` in a direction contrary to the direction of feed movement of the rack 14. The motion of said dog 44v about its pivot 45, is limited in both directions by a pin 52 projecting from the dog 41'into a notch upward. about by any suitable means.

included between the main body of the dog1 44 and an arm or branch 53 of saidv dog. The spring also acts through the dog 44 on the dog 41, tending to rock said dog 4l its pivot 42; and the motion of said dog 41 a toe 54.0f the arm 43 of said dog, which toe normally presses against the under side of one-of the ears 27 of the dog rocker. y

In order to guide the two dogs 41 and 44, the sheet metal dog rocker has an arm 55 -formed thereon and this arm is bent back upon the main body of the rocker so'a's to lie behind the dog 44 and parallel with the plane of the dog rocker, thus leaving between the body of said dog rocker and said arm 55 a slot of suitable width to guide the tivo dogs.

r1`he carriage can be fed toward the left I have here shown a cord 56 one end ot' which runs over a spring drum, not shown, and the` other end of which is connected to a iixture 57 which is secured to one of the carriage rails 3 by a screw 58. l

The two dogs are shown in the drawing so arranged as to have the action of a reverse escapelnent, that is to say, the carriage is released on. the down stroke of the key. Thisis brought about by reason of the fact that it is the dog 4l that normally engages the rack teeth 15 and the dog 44 normally stands in the position ings where it is free from the rack and wherel its tooth 47 is ready to move into engagement with the next oncoming tooth l5 of the rack. When a key is depressed and the universal 47 moves into engagement and the tooth 46 moves out of engagement, leaving the rack tree to take one step, limited by the pin 52.

On the upA stroke of the key the tooth 46 of the dog 41 moves Y same tooth that was caught and said dog 44 moves out and is restored to its normal position bythe s )rinO' 50.

by the dog 44 dogs move downward together, turning about the pivot 42 as a center, this motion in this direction is limited by* of engagement enY the carriage is pushed toward the right without raising the rack 14 bar is operated, this tooth y into engagement with the downward being resisted by the spring l50.v

In order to produce this downward motion of the dogs, each of the teeth 15, 46 and 47 is made inclined on its reverse It will be perceivedfthat the dogs 'will be face as shown.V

cammed down WhicheverI one ofthe dogs is in engagement-with 'the 'rack at the time.` Ordinarily it would be the dog 41 that would be in engagement during this operation; but if the carriage was moved toward the right while a printing key orspace key was held down and when, tooth 47' was in engagement with the rack,y

therefore, the u this 'Jamming' down operation would take. place Just the same.- It is for this reason.

dog 44: about its pivot and also of holdingI both dogs in rackengaging position, restoring said dogs to such position by them about the pivot a2 as a center.

lit will be perceived that this entire incapa-rv inent, including the dog rocher.` the two dogs, and the adjnstable' stop for limiting' the motion of the dog rocher, consists cheiy of four pieces punched out 4of sheet metal; and yet the mechanism .is thoroughly substantial and efficient.

It will be perceived in Fig. 1tliat normally the armBS is not in contact with the arm and this is the preferable construction because it is desirable ythat the dog rocker move only a short distance and this only when the printing key is near the bottom of its stroke. The precise relation between 'the arms 30 and 33 can be. regulated by an adjustment of the arm'80 made by bending the metal along the line 32.

. It is not essential that the teeth 46 and 47 be made by bending in the manner described, but teeth suitable for the purpose can be produced without the bending Vopera.- tion by using heavier stock. In one form of the escapement that I have made and found satisfactory, the-dog 41 is made of heavier ystock: than indicated herein and the tooth thereof that engages the rack is not bent, the 'dog 44; being made, as herein shown, with. the Abent-oil' tooth. y

I prefer to have the loose dog 44:v beveled and this is brought about as indicated in Fig. 3 by bending oli' the t0oth-47v through somewhat less than a right angle from the plane of the main body of the dog. When the tooth 47 `is in engagement-With the rack l5 there is, besides said beveling, nothing but the tension of the restoring spring 34 to pull said tooth out of the rack; and it is, of

` course, desirable that this spring be not too it will be noted from .that the escapementjshown is a reverse esheavy. By bevelng the dogx` as shown, the pressure of the rack against it is at such an angle as that said pressure'itselftends to overcome its own friction and to remove the loose dog out of the rack and/bring the parts bach to normal position.

what has been said capement and that the restoration of the dog rocker to normal position 1s done independently of the unlversal bar. That is to say, that whereas the arm' can move the arm 30 toward the rear of the machineLit cannot exert any pressure to restore it to normal position; and the loose dog o1 normally disengaged dog` is itself beveled in order to assist in this restoration, if necessary. The beveling of this dog also has the turning usual result of beveling any other do'g,.

1. Thaeombination with an campement` rack, of'a dog rocker consisting of a iece of sheet meta-l pivoted to the frame ot the machine and having an arm thereof bent back to constitute a guide, and a feed do pivoted to said rocker and guided by sai bent back arm.

2. The combination with an escapement rack of a dog rocker consisting of a piece of sheet metal pivoted to the framework of the machine and having Yan arm bent back to constitute a guide, a feed dog pivoted to said rocker, and a second feeddog pivotedto the first mentioned dog, both of said feed dogs being guided by said bent back arm.

3. The combination with an escapement rack, of a 4dog rocker, a feed dog mounted `on-said rocker ,and movable with relation to said rocker into and out of engagement with the rack, a second feed dog movably mounted on the first feed dog, and a spring acting on said second feed dog and through it on the first dog.

4. The combination with an escapement rack, of a dog rocker,` the dog pivoted to said rocker so as to swing about its pivot tending away from said rack, and a second dog pivoted to said arm or branch so as to swing in a direction parallel with the direction of rack movement.

5. The combination with an escapement rack, of a dog rocker, a dog pivoted to said rocker so' as to swing about its pivot into and out f engagement with the rack, and said dog having an arm or branch extending away from said rack, a second dog pivoted to said arm or branch so as to swing in a direction parallel with'the direc` tion of rack movement, and a. spring oonneeted with `said second dog andactingto swing both dogs about their respective pivots.

6. The combination with an escapement rack, of a feed dog having two' branches one lying parallel with said rack and the other extending away from said rack, a dog rocker to which the former of said arms is pivoted, and a second dog pivoted to the latter of said branches.v

7. The combination with an escapement rack, of a dog rocker, a sheet metal. dog

'into and out of engagement 'with .the rack, and said dog having an arm or branch eX- il .25. I.

the motion of :said dog `700\1tus13\o,anda. second dug plv-Umd 'to the Imst nlcfitmnad dog.

S. The combnntou n d1 an. escapa ruck, o r11' t mutui. g; roc 1 1 ears thel'ofgrwdiltbe mne/Wob:uf tlm nmuhne and. having: :2127111 'theme13 beiu im@ u plume ai; righi; zuuggos t@ h@ plane of the dog' rocker, actuating mezma @Gpel'atng with smid arm. :md menus mountad on Said dog vockm for cwpcmton with said Mok.

f).l The combination wh am escapemen rack, of L dog' rocker, a Og man pvod 1' p5 il, Sommet, :a: 

